Are you looking at multiple pictures in the play mode? If so select one image and you should go back to the standard method of right and left clicking the dial. The mode your in you can use the scroll wheel to breeze through images.

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Does the zoom switch feel loose? There was a problem with G7 zoom switches - a spring in the switch used to break sometimes. Maybe it's the same problem, although I have never seen a G9 with that problem. Anyways, you will have to give it to a camera technician, unless you have experience in camera repairs. G9 is not a complicated camera, but it's not hard to damage it without the experience. To access the top cover from the bottom side, half of the camera has to be disassembled.
Tom

The best place for service for the Powershots is: www.camerasandparts.com They only specialize in service and repairs for the Powershots and they know their stuff, they're amazing if you need service for one of these models. They don't have any service package for a powershot for over $100 including the repair, plus the service for the camera, and even the shipping back. Try them, they do amazing work and that's where most people head for service for the Powershots, good luck

If it takes normal pictures even with the black display, your LCD display is likely shot. If photos come out black, chances are that your shutter is stuck in the closed position. Sorry, but there is no safe DIY fix for either problem The camera will require professional repair.

I EASILY FIX'D THIS PROBLEM & FOUND OUT I CAN DO SOOOOO MUCH WITH SHOOTING VIDEO'S! I DID A GOOGLE SEARCH & CAME ACROSS THIS ADVICE.......TURN THE TOP DIAL ONTO VIDEO ON TOP OF CAMERA. THEN TURN DIAL ON RIGHT SIDE & YOU WILL SEE DIFFERENT SCREENS SUCH AS BLK & WHITE, VIVID COLORS, FAST OR SLOW SPEED; I TURNED MINE TO AUTO & PRESSED FUNC BUTTON IN CENTER OF WHEEL & I WAS BACK TO SHOOTING IN NO TIME........HOPE THIS HELPS!!

i beleive that your issue is a setting in the program you are using to view the video. the camera will never skew a video. you may want to change the aspect ratio in the camera to match your viewer, but you should at least be able to set the viewer to maintain aspect ratios on video viewing. try viewing the videos with a different program. i.e. if you are using windows media player, try it with quicktime and see what happens. good luck